The 579 CAC changed across three production generations — 2013–2017, 2018–2021, and 2022–2024. We stock all three. Give us your last 9 VIN digits and we'll call you back with the exact part and price. No wrong orders, no returns.
We'll look up your 579 VIN and call you with the exact part and price. Usually within a few hours during business hours.
Enter your last 9 VIN digits and phone number — we'll call you back with the exact CAC for your 579.
We'll call this number with your part and price.
Found on door jamb or dashboard. Last 9 digits tell us your exact build spec and engine.
No spam. We only call with your part information.
Three generations of the 579 use three different CAC units. All are in stock at our GTA warehouse.
Not sure which applies to your truck? Give us your last 9 VIN digits — we'll confirm the right part before you order.
The Peterbilt 579 went through significant platform changes in 2018 and again in 2022. The CAC core size, end tank design, and mounting points differ between generations. Ordering by year alone isn't always enough — the last 9 digits of your VIN encode your exact engine, build date, and configuration.
Most common 579 engine. Larger CAC core for higher boost. Standard fitment across all three 579 generations with model-specific sizing.
Lighter displacement option. Smaller CAC unit — not interchangeable with MX-13 units despite similar external appearance on some model years.
A leaking or cracked CAC reduces boost pressure to the engine. These are the most common symptoms on a 579:
Sluggish on grades or when loaded. Boost is leaking before it reaches the intake manifold.
Insufficient boost causes incomplete combustion — classic sign of a boost leak.
Low boost pressure fault code. Your diagnostic tool will point toward the intake side.
Oil in the intake from a failing turbo seal contaminates and cracks CAC end tanks.
Hot unfiltered air entering the engine raises combustion temps. A failing CAC reduces cooling efficiency significantly.
Engine compensates for lost boost by burning more fuel. Unexplained MPG drop often traces back to a boost leak.
Give us your last 9 VIN digits and phone number — we'll find the exact part and call you.